Band-saw-wheel grinder.



D. C. GRIVYEA.-

BAND SAW WHEEL GRINDER. APPLICATION FILED JUNE 4, 1907.

PATENTED DEC. 3, 1907.

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No. 872,907. 7 PATENTED DEC. 3, 1907.

D. C. GRIVYEA. I BAND SAW WHEEL GRINDER.

APPLICATION FILED JUNE 4, 1907.

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DANIEL O. GRIVYEA, OF ABERDEEN, WASHINGTON.

BAND-SAW-WHEEL GRINDER.

Specification of Letters Patent.

Patented Dec. 3, 1907.

Application flied June 4. 1907. Serial No. 377.158.

To all whom it may concern:

Be it known that I, DANIEL C. CRIVYEA, a citizen of the United States, and a resident of Aberdeen, in the county of Chehalis and State of Washington, have invented an Improved Band-Saw-WVheel Grinder, of which the followingis a specification.

The wheels or pulleys on which socalled band or endless saws run, become worn and thus acquire an uneven surface which requires to be reground from time to time in order to reproduce a perfectly true face or periphery. This operation is usually effected by a machine which is operated by a separate motor. I have devised -an improved machine which is adapted, among other peculiarities and advantages, to be driven by a belt applied to the band-saw wheels or pulleys themselves.

The details of construction, arrangement, and operation are as hereinafter described, reference being had to the accompanying drawings, in which Figure 1 is a side view of my improved machine in position for operation on bandsaw wheels. the gearing immediately connected with the grinding wheel. Fig. 3 is a view at right angles to that represented in Fig. 2, a portion being also shown in section. Fig. 4 is a horizontal section of the machine.

Referring in the first instance to Fig. 1, cc 90 indicate segmental portions of two bandsaw wheels arranged, in the usual way, opposite each other and in the same vertical plane. The parts constituting the operative mechanism by which the faces of these wheels are ground and trued are applied to a wooden frame composed of top and bottom bars 1, 1 and connecting bars, or posts, 2, 2*. These several bars are duly spaced apart, as indicated in Figs. 1 and 4. The grinding wheel 3 is mounted slidably on a feathered shaft 4 that is journaled in the forward ends of long wooden bars 5, whose rear ends are journaled on a shaft 6 having its bearings at 7 on the rear posts 2 of the frame. The grinding wheel 3 is shown working in contact with the lower bandsaw wheel, but it may be adjusted for contact with the upper one, and in either case is driven by the same means and in the same manner. For adjusting and holding it in one position or the other, I employ two screw threaded rods 8, which are supported in vertical planes, parallel to each other, on the sills 1 of the frame Fig. 2 is a side or face view ofand are curved concentrically with the shaft 7. They are connected with the swinging bars 5 that carry the grinding wheel 3, by means of arms 9 which are attached to the bars 5 and project laterally therefrom, nuts being applied above and below the arms on the rods 8, and by adjusting such nuts it is obvious the grinding Wheel 3 may be raised or lowered as required.

The grinding wheel 3 is driven from the shaft 7 by means of a belt 10 that runs on a pulley 11 fixed on said shaft and on a smaller pulley 12 fixed on the shaft 4. The shaft 7 is driven by means of a belt 13 that runs over the band-saw wheels as and over idlers 14 and a pulley 15 mounted on the shaft 7. The pulley 15 is somewhat larger than the pulley 11, as will be perceived from Fig. 1. The idlers 14 are journaled in boxes secured to the sill 1 and top bar 1 of the frame and are directly opposite each other as shown. Itis thus apparent that, in operating my improved grinder, I utilize the band-saw wheels :1: themselves, and require no separate means or motor for the purpose. In other words, in operating my grinder, the band-saw wheels are driven in the same manner as re quired for driving a saw applied to them. It is therefore obvious that the first operation to eflect grinding is to remove the saw from the wheels :0 and to place the carriage or frame in front of the mill and in the proper position indicated in Fig. l, the idlers 14 being placed exactly in line with the bandwheel faces.

For the purpose of shifting the grinding wheel 3 automatically across the faces of the band-saw wheel 90, while grinding the same, I

-mounted, is feathered, and the grinder 3 is adapted to be shifted thereon, but rotates constantly therewith. Parallel to such shaft, as indicated in Fig. 4, there is a screwthreaded shaft 17, which is rotated by means that will be presently described. On such shaft 17 is mounted a sleeve 18 having an arm 19 whose forked free end engages the groove of the extended hub 20 of the grind ing wheel. It is obvious that rotation of the shaft 18 will thus shift the grinder 3 along the shaft 4 while it rotates thereon. As indicated in Figs. 2 and 3, the screw-threaded shaft 17 is provided with a large spur gear 21 and this is driven through gear connection with a shaft 22 having a band pulley 23. A

band 24 runs from this pulley over idlers 25, see Figs. 1 and 4, to a small pulley 26 mounted on the driving shaft 7. As shown in Fig. 3 the shaft 22 of pulley 23 is journaled in a sleeve 27 which is supported rotatably in horizontal position in a bracket or post 28, which is in turn attached to and supported 4 by one of the swinging bars 5 that carry the grinder 3. A T-shape clamp-screw 29 serves to secure the sleeve 27 against rotation when set in due position. On the end of the sleeve 27 opposite the pulley 23 is mounted a bar or plate 30, the same having a hand or finger loop, Fig. 2, for convenience in use in shifting the bar as will be presently described. The shaft 22 passes through the plate 30 and a spur pinion 32 is mounted thereon. This pinion is in constant engagement with another pinion 33 and also with a gear 34. The pinion 33 is in turn meshed with a gear 3 1 The gear 34 is mounted on a stub aXle 35 that carries also a pinion 36, and the gear 34 is mounted on a similar stub aXle 35", which carries a pinion 36 As shown in Figs. 1, 2, and 3, the plate 30 is in the diagonal position required for engagement of the pinion 36 with the gear 21 fixed on the screw shaft 17. It is obvious that in this position the screw shaft will be driven in a certain direction and that the grinder 3 will be moved along the shaft 4 correspondingly; if, however, the plate 30 be shifted to the opposite oblique position, the pinion 36 will be brought into engagement with the spur gear 21 and consequently the rotation of the screw shaft 17 will be reversed, and the grinder 3 will therefore be moved in the opposite direction across the face of the band wheel which is being ground. This shifting of the plate 30 and the gears attached thereto, is effected by hand and the screw 29 is operated to release the sleeve 27 preparatory to such shifting and is again screwed down to clamp the sleeve after the change of position has been effected.

From the foregoing description, the operation of my invention will be understood in its main features. It may be added that it is always expedient to grind the bottom bandsaw wheel a; first, so that slack in the belt may be taken up and so that there will be no stretching of the belt when the top wheel is being-ground. The mill should be started very slowly and the speed increased slowly until it attains the required maximum. Since the machine has an automatic feed, it is left to grind alone until the grinder 3 reaches the lateral limit, when the feed mechanism is shifted as described in order to reverse the movement of the grinder, or in other words, to carry it back across the face of the wheel. The feed is preferably run by a li-inch belt, and the grinder is run by a 4-inch belt. The machine is driven by a 6-inch belt running around both band-wheels ac and over the idlers 14.

What I claim is 1. The combination, with a grinder and a feathered shaft on which iteis mounted rotatably but adapted to slide, and a swinging arm in which the shaft is journaled, a rotatable screw shaft arranged parallel to the feathered shaft, a sleeve traveling on such threaded shaft and connected with the grinder; means for driving the grinder, and means for driving the screw-threaded shaft, whereby the grinder is rotated and shifted along its shaft automatically, substantially as described.

' 2. The combination, with a frame, of a grinding wheel and a pivoted carrier'therefor adapted to be adjusted in a vertical plane, a feathered shaft on which the grinder is mounted and adapted to rotate and slide as described, a screw-threaded shaft arranged parallel to the feathered shaft and a threaded sleeve connecting it with the grinder, and means for driving and reversing the threaded shaft, the same comprising a spur gear mounted thereon, a train of gears and a shiftmounted and adapted to rotate and slide, as

described, of a screw-threaded shaft arranged parallel to the feathered shaft and a threaded sleeve connecting it with the grinder, and means for driving and reversing the threaded shaft, the same comprising 'a spur gear mounted thereon, a train of gears and a shiftable carrier on which the same are mounted so that either end of the train may be brought into engagement with the gear on the aforesaid feathered shaft, a driving pinion 32 from which the aforesaid train derives motion, a shaft on which such pinion is mounted, and means for driving said shaft, a rotatable sleeve to which the aforesaid adjustable carrier is attached, said sleeve having its bearings on the carrier of the grinder and the gear driving shaft passing through the same, and means for clamping the sleeve in either of the two positions to which it may be rotated for holding the train of gears in engagement with the gear on the feathered shaft, substantially as described.

DANIEL C. CRIVYEA. Witnesses:

W. D. CAMPBELL, RAGNA E. SHAKER. 

